Motorcraft Accessory Drive Belt Tensioner - BT85 Part #: BT85 Line: MOT Motorcraft Accessory Drive Belt Tensioner 2 Year LIMITED WARRANTY Contact Surface: Smooth Material: Aluminum, Steel Belt Type: Serpentine Pulley Width (in): 1-3/16 Inch Pulley Outside Diameter (in): 3-9/16 Inch Number Of Mounting Holes: 1 Pulley Inside Diameter (in): 0.670 Inch Show More Show Less